# syntax=docker/dockerfile:1.7
#
# Patch plexinc/pms-docker with the feature-unlock shared library.
#
#   docker build -f docker/Dockerfile.plexinc -t plex-crack:plexinc .
#   docker run -d --name plex --network=host \
#     -v /srv/plex/config:/config -v /srv/plex/data:/data \
#     plex-crack:plexinc
#
# Two stages:
#   1. builder   -- zig 0.13.0 cross-compile plexmediaserver_crack.so (musl)
#   2. runtime   -- layer it onto plexinc/pms-docker + override the s6 plex
#                  service so PMS is exec'd with LD_PRELOAD=...crack.so.
#                  The .so's constructor (src/main.cpp) calls unsetenv, so
#                  PMS's glibc helper children (Tuner, Script Host) are
#                  unaffected.
#
# Patch invariants are enforced at build time (RUN sanity): the upstream
# layout must match what the wrapper assumes. If plexinc/pms-docker
# restructures, the build fails here rather than the container failing
# mysteriously at runtime.

# ── Build args (global -- visible to every FROM) ──────────────────────────
ARG PLEX_BASE_IMAGE=plexinc/pms-docker:latest

# ── Stage 1: build the musl .so ────────────────────────────────────────────
FROM debian:bookworm-slim AS builder

ARG ZIG_VERSION=0.13.0
ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update \
 && apt-get install -y --no-install-recommends \
        ca-certificates curl xz-utils \
 && rm -rf /var/lib/apt/lists/*

WORKDIR /src

# Toolchain layer (cached across source-only changes).
RUN mkdir -p /src/toolchain \
 && curl -fsSL \
      "https://ziglang.org/download/${ZIG_VERSION}/zig-linux-x86_64-${ZIG_VERSION}.tar.xz" \
      -o /tmp/zig.tar.xz \
 && tar -C /src/toolchain --strip-components=1 -xf /tmp/zig.tar.xz \
 && rm /tmp/zig.tar.xz
ENV PATH="/src/toolchain:${PATH}"

# Build sources. The .dockerignore at the repo root whitelists these.
COPY build.sh ./
COPY src ./src
COPY third_party ./third_party
RUN bash build.sh
# build.sh writes /src/build/plexmediaserver_crack.so (musl).

# ── Stage 2: runtime -- patch plexinc/pms-docker ──────────────────────────
FROM ${PLEX_BASE_IMAGE} AS runtime

ARG PLEX_BASE_IMAGE
ARG PATCH_VERSION=dev
LABEL org.opencontainers.image.title="plexmediaserver-crack (plexinc)" \
      org.opencontainers.image.source="https://github.com/authrequest/Freeloader" \
      org.opencontainers.image.licenses="AGPL-3.0-or-later" \
      plex_patch.base="${PLEX_BASE_IMAGE}" \
      plex_patch.version="${PATCH_VERSION}"

# Sanity: refuse to build on an unfamiliar upstream layout.
RUN set -eux; \
    PMS="/usr/lib/plexmediaserver/Plex Media Server"; \
    PMS_LIB="/usr/lib/plexmediaserver/lib"; \
    RUN_SCRIPT="/etc/s6-overlay/s6-rc.d/svc-plex/run"; \
    [ -x "${PMS}" ]        || { echo "patcher: missing ${PMS} in ${PLEX_BASE_IMAGE}"; exit 1; }; \
    [ -d "${PMS_LIB}" ]    || { echo "patcher: missing ${PMS_LIB}/ in ${PLEX_BASE_IMAGE}"; exit 1; }; \
    [ -f "${RUN_SCRIPT}" ] || { echo "patcher: missing ${RUN_SCRIPT} in ${PLEX_BASE_IMAGE}"; exit 1; }

# Drop the .so and the in-container launcher.
COPY --from=builder /src/build/plexmediaserver_crack.so \
                    /usr/lib/plexmediaserver/lib/plexmediaserver_crack.so
COPY --from=builder /src/build/plexmediaserver_traffic_logger.so \
                    /usr/lib/plexmediaserver/lib/plexmediaserver_traffic_logger.so
COPY docker/wrapper.sh /usr/lib/plexmediaserver/plex-crack-wrapper.sh
RUN chmod 0755 /usr/lib/plexmediaserver/plex-crack-wrapper.sh

# Override the s6 plex service run file. The original is kept as .orig for
# forensics / downgrade (rebuild against the unpatched image to revert).
# plexinc's upstream service already runs as the 'plex' user, so we do not
# add s6-setuidgid here -- LSIO is the image that needs it (see its Dockerfile).
RUN set -eux; \
    RUN_SCRIPT="/etc/s6-overlay/s6-rc.d/svc-plex/run"; \
    cp "${RUN_SCRIPT}" "${RUN_SCRIPT}.orig"; \
    printf '#!/usr/bin/with-contenv bash\nexec /usr/lib/plexmediaserver/plex-crack-wrapper.sh\n' \
        > "${RUN_SCRIPT}"; \
    chmod 0755 "${RUN_SCRIPT}"